The cerebella of the early postnatal bush-baby (Galago senegalensis) and the tree shrew (Tupaia chinensis) show certain regional similarities. In the Galago lobules II and IV undergo no postnatal changein sublobulation. Vermian lobule V is either a wideflat folium or 2 sublobules and it is laterally apposed to the flocculus. The vermis of the posterior lobe of the corpus cerebelli closely resembles that of the adult. The hemispheric portions of lobules VI to VIII essentially consist of wide folia by the 2nd postnatal day. The copula pyramidis is unfissured, the paraflocculus well formed and the flocculonodular lobe moderately differentiated.The cerebellum of the early postnatal Tupaia is simple and grossly resembles the cerebellum as it appears in adult insectivores. The anterior lobe of the corpus cerebelli is only modestly formed, when compared to the Galago, however, there are limited portions to lobules HII to HV. The posterior lobe of the corpus cerebelli, with the exception of a large ansiform lobule, is similar to that seen in the Galago. The Tupaia has a larger posterior paramedian lobule and a copula that is divisible into medial and lateral portions. In the Tupaia the dorsal and ventral portions of the paraflocculus are differentiated. The flocculonodular lobe is only moderately differentiated by the 4th day.Like the rhesus monkey, and unlike many other mammals, much of the corpus cerebelli and flocculonodular lobe is differentiated prenatally in both Tupaia and Galago.